BIOL 1001 Lecture Notes - Lecture 56: Overexploitation, Introduced Species, Genetic Drift
4 Apr 2017
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Document Summary
Increases species richness, increases productivity & stability is improved resistance & resilience- ability to withstand disturbance & recover quickly from disturbance. Biodiversity has health benefits for humans -treatments from wild plants. Metapopulations forms when individuals from a species occupy small patches of habitat & from independent populations. Humans are fragmenting the environment & therefore more species are being forced into metapopulations. Throughout time, each population within metapopulation is expected to go extinct. Migration from nearby populations is critical for reestablishment of subpopulations & overall metapopulations is maintained at stable number of individuals. Ecosystem services: what the environment provides that humans take for advantage. We obtain them for free from the environment but they are worth a lot if we had to perform service. Essential chemicals cycle through the ecosystem- carbon, nitrogen, phosphorus. Population: group of interbreeding individuals that are all the same spp. Metapopulation: smaller, independent populations connected by migrants. Many spp are forced into metapopulations by habitat destructions.
